Prevent input type url default behavior using Flask

I have input type url in a form and Im trying to get the list of validation errors in the same page, but I want the form first send the data to the server and then render the error list but when the input type is set to url and I enter some other text It shows a popup and say Enter valid Url
It does it on the client side before sending any data to the server
I can use it with js and preventDefault but how can I overcome this default behavior using Flask